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Chapter 13: Q.13.67 (page 467)

What are the differences in the Fischer projections of D-galactose and L-galactose? (13.3)

Short Answer

Expert verified

D-galactose is found in such sources as lactose (milk sugar), agar, gum arabic, sugar beets, seaweed, and nerve cell membranes. L-galactose is found in flaxseed mucilage, snail galactogen, agar, and other such sources.

Step by step solution

01

Introduction

Gal-3 is a lectin that has been implicated of overexpression in metastatic cancers promoting cell migration and survival

02

Step 2:  Differences in the Fischer projections of D-galactose and L-galactose 

  • L-Galactose is the mirror image of D-galactose. In the Fischer projection of D-galactose, the -OH on carbon 2 and carbon 5 is on the right side, but on the left for carbon 3 and carbon 4 .
  • In L-galactose, the -OH groups are reversed; carbons 2 and 5 have-OH on the left, and carbons 3 and 4 have -OHon the right

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Most popular questions from this chapter

Draw the Fischer projections for D-fructose and L-fructose.

Identify the disaccharide that fits each of the following descriptions:

a. not a reducing sugar

b. composed of two glucose units

c. also called milk sugar

d. hydrolysis gives glucose and fructose

Identify the Fischer projection A to D that matches each of the following: (13.1, 13.3)

a. the L enantiomer of mannose

b. a ketopentose

c. an aldopentose

d. a ketohexose

Identify the chiral carbons if any in each of the following compounds: 13.2

What is a polysaccharide?
See all solutions

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